RFR: 1085: Gitlab PR has bad link to patch file

[Magnus Ihse Bursie]

The link generated under the "Reviewing" header in a PR description works fine on Github, but on Gitlab, the link has a Github style form which does not work.

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Commit messages:
 - 1085: Gitlab PR has bad link to patch file

Changes: https://git.openjdk.java.net/skara/pull/1191/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1191&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1085
  Stats: 25 lines in 6 files changed: 24 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/1191.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1191/head:pull/1191

PR: https://git.openjdk.java.net/skara/pull/1191